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Description

UK B.S. BS 2S 124, S.124 Specialsteel Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (free machining) (45/55 tonf/sq in: limiting ruling section 6 in) and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: S.124
Category Class Grade Standard Country Application
Steel GradesSpecialsteel S.124 B.S. UK Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (free machining) (45/55 tonf/sq in: limiting ruling section 6 in)

Chemical composition(mass fraction)(wt.%) of the S.124

C Si Mn P S Cr Ni Mo Nb/Ti Zr
0.15 -0.25 ≤1.00 ≤1.50 ≤0.045 0.15 -0.40 12.00 -14.00 ≤1.00 ≤0.60 ≤ ≥ ≤0.60

Mechanical Properties of steel grade S.124

Yield
Rp0.2 (MPa)
Tensile
Rm (MPa)
Impact
KV/Ku (J)
Elongation
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
941 (≥) 246 (≥) 43 42 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 413

Physical Properties of steel grade S.124

Temperature
(°C)
Modulus of elasticity
(GPa)
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)
Specific thermal capacity
(J/kg·°C)
Specific electrical resistivity
(Ω mm²/m)
Density
(kg/dm³)
Poisson’s coefficient, ν
23 - -     0.42 -  
744 518 - 24.3 143   -  
635 - 22 13.2   312 411

Heat Treatment of steel grade S.124

Heat treated : 1126°C - 1283°C

Technological Curves of steel grade S.124

Relevant standard of S.124

BS 2S 124 Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (free machining) (45/55 tonf/sq in: limiting ruling section 6 in) BS-2S-124.pdf

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